Discharge valve for ball and pebble mills



' L Feb. 4, 1930. R. GARLICK ETAL I r1,745,480

DISCHARGE VALVE FOR BALL AND PEBBLE MILLS Filed Nov. 28, 1924 2 Sheets-Sheet l Feb. 4, 1930. R. GARLICK E1 AL DISCHARGE VALVE FOR BALL AND PEBBLE MILLS 2 sheets-she'et 2 Filed Nov. 28, 1924 www,

Y Patented Feb. 4, 1930 PATENT orrlcs i v RALPH GARLIGK, or' ytroTAvvA Bonouerr, NEW JERSEY,y ANnI HENRY SELLMAN, 0E

Y BROOKLYN, NEWIYORK, AssIGNoRs To PAUL o. ABBE JERSEY, A ooRroRATIoN E NEW JERSEY INC., OIE' LITTLE-FALLS, NEW

DISCHARGE VALVE ron EALLAND PEBELE MrLLs Application filed November 28, 1924. Serial No. 752,638.

Thisfinventio'n relates to rotary ball and pebble mills and other hollow'drums and containers for liquid and mixed contents, yand more particularly `to the discharge valves for the same. l

The main obj ect of our invention 1s toprovide amill or drum with a discharge valve ywhose main moving member virtually consti- 'tutesa plug for the'valve casing in closed po-` sition and tends vto be retained in the closed position through kaction of the centrifugal i force produced uponrotation of the drum in- Vvolved,l due to the fact that said valve memacter whichalso has a positive means for rei i 2'0 t'aining'the valve'in tightly closed position.

'"Afurther object is'toso construct such a Y 1 V'valve thatfthemain movingy member iscongveniently and positively shifted to open positionfby simultaneous rotation and raising f y zthereof intoy thefinteriorofthemill involved in such manner'that the contents to be dis- `charged will' assist inv closing the valve kby gravity when it is'desired to close said valve. A still further object is to furnish such a f valvewith an'auxiliary closing means to afford both initial and final control of the contents" to be dischargedv through the same.y

- Other objects .and featuresy will appear hereinafter as this specification proceeds,`

i Inl'the-drawingsforming part thereof,`

. Fig. l is a view cfa rotary drum provided with a discharge valve made according to four invention and/togetherwith.saiddrum constituting anovel and' highly useful struc- -valve thereon.

'ture' inthe art. v Fig. 2 isa sectional view-ofthe same drum revealing, the position and relation of the l kFig.. Spisa bottom' plan. view yofthe dis- L45, Vcharge valve of the other views.

,4 is similar lto Fig., 2, and showsfthe chargingcover openand the discharge valve yin raised positionA and in section to further reveal.v itsconstruction.;V

Throughout'the views,'the same reference numerals indicate the same or duplicate parts. i However, `when the motor is stopped, vthe 100 ycovers for the same.

.In rotary drums, especially in ball mills of large size, it is very laborious and inconvenient to remove the very large charging covers with which such mills are usually lequipped. The reason for this is that the openings in this kind of drums are necessarily made large enough for the passage of a worlrmans body, as the lining periodically re- Vquires replacing and other repairs,iand this is therefore allowed to determine the size of the charge openings, and, incidentally the The labor is increased by the fact that the workman `must often remove and replace the cover in question several times a day.

f In t-he practice of our invention, a hollow drum l is mounted on a stand 2 which supports'the trunnion 8 of the drum, and an eX- tension 10 of the stand is adapted tos'upport a motor 9 or a similar source of motive power. A `hardened ring orl collar 5 is keyed in the trunnion,and is a sliding lit in the bore of the worm gear 3, the latter beingA housed in a casingA 4L on the stand.l The motor is furnished with a worm 7 which meshes with the gear, and the motor is therefore adapted to rotate the worm gear when in motion.

If the parts were simply made as thus far described, no movement would be transmitted to the drum l, but the gear would merely rotate about the ring 5. l But in order to introduce tangible connection between the ring and the gear, the ring is provided lwith a series of peripheral wedge slots 646, in which wedging rollers may be located in such manner that when thegear isrevolved clockwise, at least one of the rollers is sure to be inay position to drop by gravity from thefwiderfportion of the respective slot toward the narrower portion thereof'. `'As soon as the roller comes into intimate contact with the trunnion and the s-lot face a wedging action ,will take place, likewise, the ring itself beingthus subjected to pressure against the bore of. the gear on the opposite side, willV also bind, the two resulting in a good frictional connection between the worm gear and the trunnion, permitting the motor to directly rotate the drum. l

l a form of addedlutility, a discharge valvey moved.

Atate handling also of the latter.

worm gear has a tendency to come to a very early stop, but the drum by virtue of its momentum will tend to keep on rotating. This will release the wedged rollers and draw them up into the wide parts Vof their respective slots where no effective contactY or wedging of the parts is possible, With the result that :charge opening 29 of the ring by wing nuts 14e-14, and together with the ring forms a complete closure forl the upper part of the drum. The small cover is compartively light and easy to handle and involves no great labor to remove and replace when f adding charges of material and liquid media to the contents of thev mill. The large ring .need only be removed upon such rare occasions: as when actual repairs to the drum lining 27 or renewals have to be made. Even'then, the preliminary removal of the small cover will materially lighten the ring and faciliing cover has a filler of lining 'at 26 and the ring cover a lining 25 to raise the inner faces to correspond ing-27. l v n ToV complete the struct-ure of the .drumV 1n withithe interior drum lin- 28 is included inthelower part of the same, and comprises a threaded tube or hollow plug 16 slidable through the wall of the drum'and which has a series of vertical slots 2O in its side walls and an imperforate top 24. rlihe tube is retained in position by means of a threaded block 15 which fits the threaded portion of 16, and is preferably made sufficiently heavy to Counterbalance the weight of the;

covers 11 and13, and is secured to the drum by screws or by any other removable means.

If the tube should be rotated axiallyit will beraised orV lowered, by virtue of its threaded portion being engaged by the block, and when thus raised, the slots in the upper 'partof the tube will be exposed above theV inner surface of the wall of ,the drum to whatever contents may be in the interior of the same, and will, of course, permit said contents to Idrain out through these slots and the tube. The upper extremity 21 of the valve Acasing is preferably iiush with the inner surface of the drum wallV so as to virtually constitute a part thereof.

lThe lower partV of the tube is exteriorly provided with castellations 23-23 toadapt the same for rotation by means of a Spanner wrench or the like, and interiorly is provided with a sliding plateA 18 by which to control intermittent discharge of material from the tube opening 19. The'handle pin 17 isV attached to the plate by which to move the latter, and may fit into one 'of the castellations in retracted and inoperative position. `It is easily seen that'the'tube may as a whole be projected only part of the way up into the drum, or all its possibleextension therein, according to the desire of the operative, and this allows of great facility in adjustment and controlbothof the drum', and the contents of the same. f

Y Slight variations and modifications ofour invention may be made without departing from the spirit thereof, such was omitting the sliding plate 18, should we desire to do so.

Having now rfully described our invention, we claim :-y o

1.. In a rotatable drumhaving 'a discharge valve in the wall thereof,l saidlvalve including a slidable tube iny said wall provided with a closed top, a perforate portion in the wall yof said tube beneath said closed top and,

a threaded portion below saidperforateportion, a threaded block upon said drum .ar-V Y ranged toreceive the threaded portion of said tubetand actuating means upon said tubevfor rotating the same so as to projectV and. withe5k Y draw the tube into and from the interior of Y said drum in order to eXpose said perforate portion tothe interi-or ofthe drum or to Y l e n 'n n `drum interior in such manner that inthe o cover and close said tube with respect to said projected position of said valve tube, the

'same will vconstitutea projection into said drum and inthe withdrawn position, thev close top thereof will be 'sunk approimate'- ly flush withthe interior wall of the drum and will substantially forma part thereof.

2. A rotatable drum having a discharge valve vin the peripheral `wall thereof, said valve including a slidable tube having a closedy top, a perforate portion in the Wall of the tube and a threaded portion yalso disposed on-said tube, there being a block on said drum wall arranged toit said threaded portion of the tube, and projections disposed upon the exterior of said tube-whereby'to axially rotate the same and thereby raise and l expose said perforate portionabove, the in- 'i nerl surface of the wall of the drum' in order torpermit draining lof fluids from said drum through saidperforate tube portion and tube, the top of the tube, in closedpositionconstituting an imperforateplug in the interior wall of said drum.V o

3. A4 dischargevalve including a casing,

ingv and providedQ-"withfa closed top,*said tube also having aA perforated l'portion in 5125 a tube slidable through the wall of said cas-y the wall thereof belowsaid top. and normally closedv by thewall of; easing, means to raise said tube and thereby expose said perforated portion above the Wall of the casing,

Y and means at the lower extremity of said tube to regulate discharging through the tube,

including a transversely sldablel plate arranged in retracted position to close the opening of; the tube,a nd means u on said lower vtube extremity toretain sai p plate in conf tact with said extremity.

,4. In a discharge valve, the combination with a casing, of a tubular member axially lslidable through ythe wall thereof, an imkperforate top closing one extremity of said tube, means to close the yother extremity independentlyr at Will, there being a plurality of apertures in said tube adapted to be exposed beyond one side ofthe Wall of said casing when moved to project therefrom in 'Y one direction, and means to move said tube Yaxially 1n either direction, at Will, relative to said casing.

Signed at Little Falls, Passaic County, and State of'NeW Jersey, on this 3rd day of November, 1924.

' e 4 RALPH GARLICK.

HENRY SELLMAN.

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